When I came across this book, I wondered how could one possibly write a book about receding glaciers that fills up so many pages? It was that curiosity that made me pick it up, and I'm glad that I did so.
He starts off addressing the importance of glaciers and glacial melt for the ecosystem. What constitutes stable glaciers, how they are measured, and what is likely to happen when they are gone. He then moves on to talk about rising temperatures in general - they cause glaciers to recede surely, but they also cause an increase in the frequency of fires, and according to the scientist he's talking to (Dan Fagre) for most part of the book, warming also might cause a temporary increase and then ultimately a decrease in the frequency and effectiveness of avalanches. "Effectiveness" might sound surprising, but I learned that avalanches play a crucial role in maintaining the health of a forest, much like fire. But both have to be in the right frequencies. He talks about the effects of all of these factors on the survival of several animals such as cutthroat trout, mountain goats, pikas, wolverines, stonefly and of course, trees.
Included with all this are also some very interesting anecdotes of the author's own mountaineering adventures.
And for all of this, I would give the book five starts.
But there are sections in the book which are incredibly dull. These mainly talk about the people measuring the glaciers (officials of the USGS) and list some of their conversations etc. While it is interesting to know who is working on these issues and what their backgrounds are like, I don't find it interesting to know what color their parkas or backpacks were and when they picked up the backpacks and when they put them down. Or how cluttered their desks are and how many cups of coffee they've had. These sections of the book also felt poorly/awkwardly written, which is surprising because he's quite good with the other sections.